Harry Styles' annual winter romance is again rumoured to be causing problems among his One Direction bandmates, with Kendall Jenner allegedly "causing a lot of unrest".

When Harry was dating Caroline Flack in 2012 and Taylor Swift in 2013, speculation was flying about like mad that problems were emerging in the 1D camp, and now history is repeating - and it is claimed that the Keeping Up With The Kardashians star is setting a new record in trouble-making.

Harry Styles and Kendall Jenner (Splash News)

"Kendall’s a sweet girl, but they [the One Direction boys] see her as a bigger threat than Taylor Swift ever was," a source reportedly told OK! magazine.

"Kendall seems to have cast a spell over Harry, and it’s disrupting other areas of his life because he’s always wanting to spend time with her or chat with her on the phone when they’re apart. It’s causing a lot of unrest."

If the mag's report is to be believed, even Mr Nice Guy Niall Horan is losing his cool.

Harry Styles at the NRJ Awards (WENN)

"[Harry] seems to be losing interest in the band. The other day, Harry and Niall almost [fought] when Niall confronted Harry when he showed up to a meeting," the alleged insider added.

The five-piece are currently coming to the end of their downtime after a super-hectic 2013, which saw them spending months travelling the world on tour as well as releasing an album and a movie.

Their stadium jaunt Where We Are is due to kick off in the coming months, and they're also due to unveil their new music video for 'Midnight Memories' later today (January 31).